What is S-Tronic Transmission?
The S tronic combines the sporty characteristics of a manual gearbox with the advantages of an automatic.
Gear-changes with the dual-clutch gearbox are performed easily and with no appreciable delay. Depending on the driver’s preference, the gears may be shifted in fully automatic mode or in manual mode using the gearshift paddles on the steering wheel.
The dual clutch forms the technical basis of the S tronic. One of the two clutches engages the odd-numbered gears and reverse, the other engages the even-numbered gears. The benefit: a gearbox that shifts from one gear to the next in less than 0.2 seconds and with no interruption in power flow.
When in operation, one gear is always engaged and another is pre-selected: while the first clutch is transmitting power in one gear, the second clutch has the next gear selected and ready to engage. When the gearshift point is reached, one clutch segment opens in a flash while the other closes.
The driver therefore hardly notices the gearshift process. The consistently efficient power transmission ideally supports a sporty driving style – both in automatic mode and with manual shifting: Other advantages of S tronic: the gearbox’s high efficiency leads to low fuel consumption and reduced emissions.
Source: Audi
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Common S-Tronic Faults
Below are some issues with S-Tronic transmissions that are common:
S-Tronic DL501 Gearbox 4×4(Quattro)
Audi A4, A5, A6, Q3, Q5 Models
Mechatronic faults:
- Car Drive Only With Odd Gears 1,3,5,7 No Reverse*
- Car Drive Only With Even Gears 2,4,6,R*
- Car Don’t go Into Drive or Power Loss (diagnostic interface shows clutch overheating fault)*
- Hard D or R Engagement*
- Harsh Downshifting (especially when gearbox gets hot)*
* in case of this symptoms mechatronic unit need to be regenerated as soon as posible to prevent further damages, too late reactions may require a whole mechatronic unit and clutch replacement.
Note that it is very important to keep your Mechatronic software up to date.
Clutch Faults:
- Car Move With Jerking*
- Clutch Slipping*
- Losing Power (reverse or drive)*
- Hard D or R Engagement*
* It applies mostly car models made before 2011, in this cases DL501 dual-clutch assembly need to be replaced.
S-Tronic DQ200 7 Speed Gearbox
- Mechatronic Hydraulic Pressure (error codes about insufficient pressure, pump play protections)
- Solenoids, Valves and Sensor Faults
- Clutch Slipping or Shudder
Note that it is very important to do an oil an filter service every 50 000km.
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